just for the record MDN's site, hands down, has the best documentation ever made by any agent of the programming industry
I do found more minor errors in MDN compared to other official documentation (like Python), but it's kinda understandable.
And it sometimes takes months to get things fixed (after reporting or providing PR at https://github.com/mdn/content).
I've learned to always test myself when it comes to pesky/obscure behavior(s) of JS.